Penang has vowed to take firm action against those involved in illegal dumping of waste.

Penang executive councillor Jagdeep Singh Deo said the local councils - Penang Island City Council and Seberang Perai Municipal Council (MPSP) - have been instructed to nab the perpetrators of the act.

"I have instructed them to be firm as we will not tolerate such behaviour and those who are found to be involved must be brought to justice," Jagdeep told reporters today.